Butting hardboard panels together?
I want to attach 1/8" tempered hardboard panels to a simple 1x3 frame that will be 105" x 59". The outer surface will be sanded, primed, and painted. What I'm trying to make is a DIY projector screen so it goes without saying that the finished product would need to have a perfectly homogenous seamless appearance. I wanted to get Eucaboard panels from Home Depot because they are cheap, lightweight, and readily available. However, reading through the literature, it says NOT to butt these panels up tight because they could buckle. My original plan was to either butt the boards up tight together and use a high build primer to cover the seams or leave about 1/16" to 1/8" gap and fill with bondo wood filler. Apparently the first method sounds like a no go, what about leaving a gap and using bondo? What are my options? Appreciate any advice, thanks.